Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A pixel circuit, comprising: a driver transistor, a data writing sub-circuit, an initializing sub-circuit, a voltage prewriting sub-circuit, a threshold compensating sub-circuit, a first light-emission control sub-circuit, a second light-emission control sub-circuit, a capacitor and a light-emitting element, wherein: the initializing sub-circuit has an output terminal connected with a gate of the driver transistor, and is configured to initialize the gate of the driver transistor under the control of a first scan signal terminal; the data writing sub-circuit has an output terminal connected with a first electrode of the driver transistor, and is configured to provide a signal of a data signal terminal to the first electrode of the driver transistor under the control of a second scan signal terminal; the capacitor is connected between the gate of the driver transistor and a first node, and configured to be charged or discharged according to a potential at the gate of the driver transistor and a potential at the first node; the voltage prewriting sub-circuit has an output terminal connected with the first node, and is configured to provide a signal of a light-emission supply voltage terminal to the first node under the control of a prewriting control terminal; the threshold compensating sub-circuit is connected between the gate of the driver transistor and a second electrode of the driver transistor, and configured to connect the gate of the driver transistor with the second electrode of the driver transistor under the control of the second scan signal terminal; the first light-emission control sub-circuit is connected between the first node and the first electrode of the driver transistor, and configured to provide voltage of a first voltage source respectively to the first electrode of the driver transistor and the first node under the control of a first light-emission control terminal; and the second light-emission control sub-circuit is connected between the second electrode of the driver transistor and the light-emitting element, and configured to connect the second electrode of the driver transistor with the light-emitting element under the control of a second light-emission control terminal.
A pixel circuit for displays, comprising a driver transistor, a data writing sub-circuit, an initializing sub-circuit, a voltage prewriting sub-circuit, a threshold compensating sub-circuit, a first and a second light-emission control sub-circuit, a capacitor, and a light-emitting element. The initializing sub-circuit connects to the driver transistor's gate, initializing it via a first scan signal. The data writing sub-circuit provides a data signal to the driver transistor's first electrode using a second scan signal. A capacitor connects the driver transistor's gate and a first node, charging/discharging based on their potentials. The voltage prewriting sub-circuit supplies a light-emission supply voltage to the first node via a prewriting control signal. The threshold compensating sub-circuit links the driver transistor's gate and second electrode, controlled by the second scan signal. The first light-emission control sub-circuit provides a first voltage source to both the driver transistor's first electrode and the first node, managed by a first light-emission control signal. Finally, the second light-emission control sub-circuit connects the driver transistor's second electrode to the light-emitting element, controlled by a second light-emission control signal.
2. The pixel circuit according to claim 1 , wherein the voltage prewriting sub-circuit comprises a first transistor, wherein: the first transistor has a gate connected with the prewriting control terminal, a first electrode connected with the light-emission supply voltage terminal, and a second electrode connected with the first node.
A pixel circuit for display devices, particularly organic light-emitting diode (OLED) displays, addresses the challenge of achieving uniform and stable light emission by controlling voltage levels in the circuit. The circuit includes a voltage prewriting sub-circuit designed to initialize the voltage at a specific node before the light-emitting phase. This sub-circuit comprises a first transistor that acts as a switch. The transistor's gate is connected to a prewriting control terminal, allowing external control of the switching operation. The first electrode of the transistor is connected to a light-emission supply voltage terminal, providing the necessary voltage for prewriting. The second electrode is connected to a first node, which is a critical point in the circuit where voltage levels are adjusted. When activated, the transistor allows the supply voltage to prewrite the voltage at the first node, ensuring proper initialization before the light-emitting element operates. This prewriting step is essential for maintaining consistent brightness and reducing variations in display performance. The transistor's configuration ensures efficient voltage transfer while minimizing power consumption and signal interference. The overall design improves display uniformity and reliability by stabilizing the initial voltage conditions.
3. The pixel circuit according to claim 2 , wherein the first light-emission control sub-circuit comprises a second transistor and a third transistor, wherein: the second transistor has a gate connected with the first light-emission control terminal, a first electrode connected with the first voltage source, and a second electrode connected with the first node; and the third transistor has a gate connected with the first light-emission control terminal, a first electrode connected with the first voltage source, and a second electrode connected with the first electrode of the driver transistor.
This pixel circuit, which includes a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element, enables gate initialization, data writing, prewriting of a light-emission supply voltage, threshold voltage compensation, and light emission control. The voltage prewriting sub-circuit specifically uses a first transistor with its gate connected to a prewriting control terminal, its first electrode to the light-emission supply voltage terminal, and its second electrode to the first node. Furthermore, the *first light-emission control sub-circuit* is implemented using a second transistor and a third transistor. The second transistor has its gate connected to a first light-emission control terminal, its first electrode connected to a first voltage source, and its second electrode connected to the first node. The third transistor also has its gate connected to the first light-emission control terminal, its first electrode connected to the first voltage source, and its second electrode connected to the first electrode of the driver transistor.
4. The pixel circuit according to claim 3 , wherein the prewriting control terminal and the first light-emission control terminal are a same signal terminal; and the first transistor is an N-type transistor, and the second transistor and the third transistor are P-type transistors; or the first transistor is a P-type transistor, and the second transistor and the third transistor are N-type transistors.
This pixel circuit, featuring a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element, uses a first transistor for voltage prewriting to a first node. The first light-emission control sub-circuit employs a second transistor providing a first voltage source to the first node and a third transistor providing the first voltage source to the driver transistor's first electrode, both controlled by a first light-emission control terminal. Additionally, this circuit specifies that the *prewriting control terminal and the first light-emission control terminal are the same signal terminal*. Furthermore, there are two distinct transistor type configurations: either the first transistor is N-type while the second and third transistors are P-type; or the first transistor is P-type while the second and third transistors are N-type.
5. The pixel circuit according to claim 3 , wherein the second light-emission control sub-circuit comprises a sixth transistor, wherein: the sixth transistor has a gate connected with the second light-emission control terminal, a first electrode connected with the second electrode of the driver transistor, and a second electrode connected with the light-emitting element.
This pixel circuit, including a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element, implements its voltage prewriting using a first transistor that connects the light-emission supply voltage terminal to a first node via a prewriting control terminal. Its first light-emission control sub-circuit uses a second transistor to connect a first voltage source to the first node and a third transistor to connect the first voltage source to the driver transistor's first electrode, both controlled by a first light-emission control terminal. Furthermore, the *second light-emission control sub-circuit* is implemented using a sixth transistor. This sixth transistor has its gate connected to a second light-emission control terminal, its first electrode connected to the second electrode of the driver transistor, and its second electrode connected to the light-emitting element.
6. The pixel circuit according to claim 5 , wherein the second light-emission control terminal and the first light-emission control terminal are a same signal terminal; and all of the second transistor, the third transistor, and the sixth transistor are N-type transistors; or all of the second transistor, the third transistor, and the sixth transistor are P-type transistors.
This pixel circuit, featuring a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element, uses a first transistor for voltage prewriting to a first node. The first light-emission control sub-circuit employs a second transistor connecting a first voltage source to the first node, and a third transistor connecting the first voltage source to the driver transistor's first electrode, both via a first light-emission control terminal. The second light-emission control sub-circuit uses a sixth transistor to connect the driver transistor's second electrode to the light-emitting element via a second light-emission control terminal. Additionally, the *second light-emission control terminal and the first light-emission control terminal are the same signal terminal*. This circuit specifies two transistor type configurations: either all of the second, third, and sixth transistors are N-type; or all of the second, third, and sixth transistors are P-type.
7. The pixel circuit according to claim 1 , wherein the data writing sub-circuit comprises a fourth transistor, wherein: the fourth transistor has a gate connected with the second scan signal terminal, a first electrode connected with the data signal terminal, and a second electrode connected with the first electrode of the driver transistor.
This pixel circuit includes a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element. It facilitates gate initialization, data writing, voltage prewriting to a capacitor connected between the driver's gate and a first node, threshold voltage compensation, and controlled light emission. Specifically, the *data writing sub-circuit* is implemented using a fourth transistor. This fourth transistor has its gate connected to the second scan signal terminal, its first electrode connected to the data signal terminal, and its second electrode connected to the first electrode of the driver transistor.
8. The pixel circuit according to claim 1 , wherein the threshold compensating sub-circuit comprises a fifth transistor, wherein: the fifth transistor has a gate connected with the second scan signal terminal, a first electrode connected with the gate of the driver transistor, and a second electrode connected with the second electrode of the driver transistor.
This pixel circuit includes a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element. It facilitates gate initialization, data writing, voltage prewriting to a capacitor connected between the driver's gate and a first node, threshold voltage compensation, and controlled light emission. Specifically, the *threshold compensating sub-circuit* is implemented using a fifth transistor. This fifth transistor has its gate connected to the second scan signal terminal, its first electrode connected to the gate of the driver transistor, and its second electrode connected to the second electrode of the driver transistor.
9. The pixel circuit according to claim 1 , wherein the initializing sub-circuit comprises a seventh transistor, wherein: the seventh transistor has a gate connected with the first scan signal terminal, a first electrode connected with an initial signal terminal, and a second electrode connected with the gate of the driver transistor.
This pixel circuit includes a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor, and a light-emitting element. It facilitates gate initialization, data writing, voltage prewriting to a capacitor connected between the driver's gate and a first node, threshold voltage compensation, and controlled light emission. Specifically, the *initializing sub-circuit* is implemented using a seventh transistor. This seventh transistor has its gate connected to the first scan signal terminal, its first electrode connected to an initial signal terminal, and its second electrode connected to the gate of the driver transistor.
10. The pixel circuit according to claim 1 , wherein: the voltage prewriting sub-circuit comprises a first transistor, the first transistor has a gate connected with the prewriting control terminal, a first electrode connected with the light-emission supply voltage terminal, and a second electrode connected with the first node; the first light-emission control sub-circuit comprises a second transistor and a third transistor, the second transistor has a gate connected with the first light-emission control terminal, a first electrode connected with the first voltage source, and a second electrode connected with the first node; and the third transistor has a gate connected with the first light-emission control terminal, a first electrode connected with the first voltage source, and a second electrode connected with the first electrode of the driver transistor; the data writing sub-circuit comprises a fourth transistor, the fourth transistor has a gate connected with the second scan signal terminal, a first electrode connected with the data signal terminal, and a second electrode connected with the first electrode of the driver transistor; the threshold compensating sub-circuit comprises a fifth transistor, the fifth transistor has a gate connected with the second scan signal terminal, a first electrode connected with the gate of the driver transistor, and a second electrode connected with the second electrode of the driver transistor; the second light-emission control sub-circuit comprises a sixth transistor, the sixth transistor has a gate connected with the second light-emission control terminal, a first electrode connected with the second electrode of the driver transistor, and a second electrode connected with the light-emitting element; the initializing sub-circuit comprises a seventh transistor, the seventh transistor has a gate connected with the first scan signal terminal, a first electrode connected with an initial signal terminal, and a second electrode connected with the gate of the driver transistor.
This comprehensive pixel circuit includes a driver transistor, a capacitor connected between its gate and a first node, and a light-emitting element. It also integrates sub-circuits for data writing, initializing, voltage prewriting, threshold compensating, and light-emission control. The *voltage prewriting sub-circuit* uses a first transistor, whose gate connects to a prewriting control terminal, first electrode to the light-emission supply voltage terminal, and second electrode to the first node. The *first light-emission control sub-circuit* uses a second transistor (gate to first light-emission control terminal, first electrode to a first voltage source, second electrode to the first node) and a third transistor (gate to first light-emission control terminal, first electrode to the first voltage source, second electrode to the driver transistor's first electrode). The *data writing sub-circuit* uses a fourth transistor with its gate to a second scan signal terminal, first electrode to a data signal terminal, and second electrode to the driver transistor's first electrode. The *threshold compensating sub-circuit* uses a fifth transistor with its gate to the second scan signal terminal, first electrode to the driver transistor's gate, and second electrode to the driver transistor's second electrode. The *second light-emission control sub-circuit* uses a sixth transistor with its gate to a second light-emission control terminal, first electrode to the driver transistor's second electrode, and second electrode to the light-emitting element. Finally, the *initializing sub-circuit* uses a seventh transistor with its gate to a first scan signal terminal, first electrode to an initial signal terminal, and second electrode to the driver transistor's gate.
11. A method for driving the pixel circuit according to claim 1 , the method comprising: in an initialization period, initializing, by the initializing sub-circuit, the gate of the driver transistor under the control of the first scan signal terminal, providing, by the voltage prewriting sub-circuit, the signal of the light-emission supply voltage terminal to the first node under the control of the prewriting control terminal, and charging the capacitor; in a data writing period, providing, by the data writing sub-circuit, the signal of the data signal terminal to the first electrode of the driver transistor under the control of the second scan signal terminal, connecting, by the threshold compensating sub-circuit, the gate of the driver transistor with the second electrode of the driver transistor under the control of the second scan signal terminal, providing, by the voltage prewriting sub-circuit, the signal of the light-emission supply voltage terminal to the first node under the control of the prewriting control terminal, and charging the capacitor until the voltage at the gate of the driver transistor is the threshold voltage of the driver transistor plus the voltage of the data signal terminal; and in a light-emission period, providing, by the first light-emission control sub-circuit, the voltage of the first voltage source respectively to the first electrode of the driver transistor and the first node under the control of the first light-emission control terminal, connecting, by the second light-emission control sub-circuit, the second electrode of the driver transistor with the light-emitting element under the control of the second light-emission control terminal, keeping, by the capacitor, the voltage at the gate of the driver transistor to be stable, and driving, by the driver transistor, the light-emitting element to emit light.
This describes a method for driving a pixel circuit, which consists of a driver transistor, data writing, initializing, voltage prewriting, threshold compensating, and light-emission control sub-circuits, a capacitor (between the driver's gate and a first node), and a light-emitting element. The method operates in three periods: 1. **Initialization Period:** The initializing sub-circuit initializes the driver transistor's gate via a first scan signal. Simultaneously, the voltage prewriting sub-circuit provides the light-emission supply voltage to the first node via a prewriting control terminal, charging the capacitor. 2. **Data Writing Period:** The data writing sub-circuit provides a data signal to the driver transistor's first electrode via a second scan signal. The threshold compensating sub-circuit connects the driver transistor's gate and second electrode via the second scan signal. The voltage prewriting sub-circuit again provides the light-emission supply voltage to the first node via the prewriting control terminal, charging the capacitor until the voltage at the driver transistor's gate equals its threshold voltage plus the data signal voltage. 3. **Light-Emission Period:** The first light-emission control sub-circuit provides a first voltage source to both the driver transistor's first electrode and the first node via a first light-emission control terminal. The second light-emission control sub-circuit connects the driver transistor's second electrode to the light-emitting element via a second light-emission control terminal. During this, the capacitor stabilizes the voltage at the driver transistor's gate, causing the driver transistor to drive the light-emitting element.
12. An organic light-emitting diode display panel, comprising the pixel circuit according to claim 1 .
An organic light-emitting diode (OLED) display panel includes a pixel circuit. This pixel circuit features a driver transistor, a data writing sub-circuit, an initializing sub-circuit, a voltage prewriting sub-circuit, a threshold compensating sub-circuit, a first light-emission control sub-circuit, a second light-emission control sub-circuit, a capacitor connected between the driver transistor's gate and a first node, and a light-emitting element. This setup allows for initialization of the driver's gate, writing of data signals, prewriting of a light-emission supply voltage to the capacitor, threshold voltage compensation, and controlled light emission for the display.
13. A display device, comprising the organic light-emitting diode display panel according to claim 12 .
A display device includes an organic light-emitting diode (OLED) display panel. This panel integrates a pixel circuit that features a driver transistor, a data writing sub-circuit, an initializing sub-circuit, a voltage prewriting sub-circuit, a threshold compensating sub-circuit, a first light-emission control sub-circuit, a second light-emission control sub-circuit, a capacitor connected between the driver transistor's gate and a first node, and a light-emitting element. This pixel circuit enables functions like gate initialization, data signal writing, prewriting of a light-emission supply voltage to the capacitor, threshold voltage compensation, and controlled light emission, all within the display device.
Unknown
July 28, 2020
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